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(No Model.)

HUNGERFORD..

GRINDING MILL.

No. 295.764. Patented Mar. 25. 1884.

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` ASSIGNMENTS, TO THE UNITED Y' PAN-Y, OF NEV YORK, N. Y.

STATES COTTON SEED CLEANING COM- SPECIFICATION `forifniag part ofLetters Patent No. 295'764, dated lVIarch 25, 1884. Application lcdSeptember 15x 1881. (No model.)

To @ZZ whom t may concern:

n Be it known that I, HENRY H'UNGERFORD,

of Norwalk, in the county of Fairfield and State of Connecticut, haveinvented a new and useful Improvement in Grinding-Mills, of

which the following is a full, clear, and exact description.

My improvements relate lo cylinder andV concave mills for reducing grainand other ma 1o terials, and have the special object to save regrindingof the materials, as heretofore necessary in that classof mills.

In the drawings, Figure lis a verti cal transverse section of theimproved mill. Fig. 2 is a horizontal section on line m x of Fig. l.Fig. 3 is a detail section showing the construction of therevolvinggrinder. Fig. 4. is ade- 'tail section showing one end of thestationary grinder, and Fig. 5 shows the. separate por- 2o tions orsections of which the grinders are formed.

A is the supporting-frame of the mill, covered by a curb, B, thatsupports a hopper, C, all of which parts may be of any suitableconstruction.

D is the revolving grinder on a shaft, a, that is sustained on frame A,and is to be driven by suitable power.

E is the fixed grinder, formed of platesec- 3o tions b, tied by a rod,c, and supported by orossbars d beneath. p

The revolving grinder D may be a roller or cylinder having a iiuted orribbed surface; but I prefer the construction shown, in which a 3 5hollow cylinder, e, is iixed on the shaft a., and rings f, of V form ontheir outer surfaces, are placed around the cylinder and clamped betweenend disks, g, by nuts le, that take on the hubs of cylinder e. Theserings or sectionsf 4o are of steel, and their beveled surfaces aregrooved to form cuttingledges.

The plates of which the stationary grinders E are formed are of V formon their ends contiguous to the grinder D, and the ends enter betweenthe rings f; The platesare curved to extend from about the horizontalcenter line of `roller D to the under side of the roller, and I preferthat the space between the grinders D E should decrease from the upperto the lower or delivery point. The plates b are all alike, and are tiedtogether by a rod, c, pass ing through said plates, and are clamped bynuts upon the ends of the said rod. This rod c passes throughbearing-blocks a at its ends. These blocks rest in boxes, (shown indotted lines in Figs. l and 2,) said boxes being of greater horizontallength than the blocks, so that the rod can be moved forward or back- 4ward. Set screws l l serve to adjust the blocks and the rod, and to holdthe grinder in proper position. The grinder E may turn slightly upon theshaft c, and the front or grindingV edge may be adjusted in relation to`the revolving grinder D by means of the setscrews m, which pass throughhangers l, and bear against bars d, extending across underneath theplates b. By means of these` adjustingscrews the grinder E may be swungso as to regulate the space vbetween it and therevolving grinder, as maybe desired. `The bars "d, one being behind and the other in front of theboltingrod c, serve to hold the grinder steadily in any position inwhich it may be set, and by the set-screws 'm the space between thegrinding-surfaces above or below may be widened or narrowed at pleasure.

` Above the grinder E is fixed an inclined plate, p, that is shaped tolead the material to the grinders. Side plates, o, are also provided toconne the material at the ends of the roller D. By this construction Iobtain an extent of grinding-surface equal to one-quarter thecircumference of the revolving grinder, and sufficient to reduce thematerial at once without regrinding.'A There will be continual reductionfromthe pointwhere thematerial enters between the surfaces to thedelivery at the under, side, and the extent of reduction can be variedby adjustment. Vith` materials that require to be coarsely ground orsimply cracked, the stationary grinder will be formed of narrow plates.

The form and size of ribs on the revolving and stationary grinders maybe varied, and the grooves or teeth also made in suitable form,according to the materials to be ground. Having thus described myinvention, I claim as new and desire to secure by Letters Patent to therevolving grinder D, said grinding- 15 faces being adjustable verticallyby means of set-screws m in the hangers Z, substantially as described.

3. In a grinding-mill, the Kconibinationof a revolving grinder, D, andthe grinder E, conl- 2o posed of plates and tie-rod c, as described7 thesaid rod c having its bearings in adjustable blocks in the frame,substantially as described.

HENRY HUNGERFORD.

Vitnesses:

Gno. D. WALKER, C. SEDGWICK.

